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Painting in swing in java


                           Painting in swing

                                                      
Painting is used, when we want to change or enhance an existing widget. Or if we are creating a custom widget from scratch. To do the painting, we use the painting API provided by the Swing toolkit.

The painting is done within the paintComponent() method. In the painting process, we use the Graphics2D object.



2D Vector Graphics


There are two different computer graphics.

·         Vector graphics

·         raster graphics

Raster graphics represents images as a collection of pixels. Vector graphics is the use of geometrical primitives such as points, lines, curves or polygons to represent images. These primitives are created using mathematical equations.
Both types of computer graphics have advantages and disadvantages. The advantages of vector graphics over raster are:
  • smaller size
  • ability to zoom indefinitely
  • moving, scaling, filling or rotating does not degrade the quality of an image



Types of primitives

  • points
  • lines
  • polylines
  • polygons
  • circles
  • ellipses
  • Splines
 
Points

The most simple graphics primitive is point. It is a single dot on the window. There is no method to draw a point in Swing. To draw a point, we use the drawLine() method. We use one point twice.
 

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